JPH09157738A - Gas dehydrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas dehydrator capable of preventing the lowering of the heat exchangeability in a cooler and capable of prolonging the period of inspection and maintenance in the cooler. SOLUTION: A cooler 1 is installed in a gas dehydrator, and a heat-transfer coil 9 consisting of a metallic tube, etc., and through which water is passed is furnished in the cooler 1. Both ends 9a and 9b of the coil 9 are connected to a water circulating pipeline 8 outside the cooler 1. A brine tank 4 for storing water, stop valves 7a and 7b and a pump 5 are arranged on the pipeline 8. further, a heat exchanger 6 is furnished to cool the water in the pipeline 8 with a refrigerant (CFC). The cooler for cooling the water in the pipeline 8 by the heat exchanger 6 is so constituted that the CFC is circulated through the inside of a CFC pipeline 18, a compressor 11 and a condenser 12 are arranged in the CFC pipeline 18, and a solenoid valve 14 and an expansion valve 15 are furnished between the condenser 12 and heat exchanger 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas dehydrator for cooling the atmospheric gas used in a heat treatment furnace to reduce water in the atmospheric gas.

[0002]

2. Description of the Related Art FIG. 2 is a schematic view showing a conventional gas dehydrator. As shown in FIG. 2, a conventional gas dehydrator is provided with a cooler 21, and in this cooler 21, a heat exchange section 29 made of a meandering metal tube or the like is arranged. Further, the cooler 21 is provided with a blow-in port 22 for feeding the atmospheric gas used in the heat treatment furnace, and a blow-out port 23 for feeding the cooled atmospheric gas.

Both tube ends 29a and 29b of the heat exchange section 29 are
Outside the cooler 21, the inside of the cooler 21 is a refrigerant (CFC).
Is connected to the flow path pipe 28. This channel tube 2
A compressor 26 and a condenser 27 are provided in the middle of 8, and an expansion valve 25 is provided between the condenser 27 and the heat exchanger 29.

In the conventional gas dehydrator having such a structure, the atmospheric gas is cooled in the following manner to remove the water content in the atmospheric gas. First, the CFCs in the flow path pipe 28 are brought into a high temperature and high pressure superheated gas state by the compressor 26. After that, this Freon gas is condensed in the condenser 27.
When it is sent to, it loses heat and liquefies. Then, the liquefied chlorofluorocarbon passes through the expansion valve 25 to be depressurized and rapidly vaporized, and the vaporized chlorofluorocarbon is sent to the heat exchanger 29. The vaporized CFCs in the heat exchanger 29 remove the heat of vaporization in the cooler 21 to cool the inside of the cooler 21. At this time, the atmospheric gas sent into the cooler 21 from the blowing port 22 is cooled, and the moisture in the atmospheric gas adheres to the surface of the heat exchange section 29, whereby the atmospheric gas is dehydrated. Then, the dehydrated atmospheric gas is sent out from the outlet 23 of the cooler 21 and is enclosed in the heat treatment furnace.

[0005]

However, usually,
There is dust such as minute dust in the atmosphere gas, and when the atmosphere gas is cooled in the cooler 21, dust in addition to water adheres to the surface of the heat exchange unit 29, so The heat exchange performance due to the CFCs in the exchange section 29 is deteriorated. For this reason, the chlorofluorocarbon cannot obtain the heat of vaporization, and the pressure drops. As a result, the operation of the dehydrator itself may stop, and the heat exchange unit 2 is regularly
It is necessary to perform the inspection and maintenance of 9.

The present invention has been made in view of the above problems, and it is possible to prevent deterioration of heat exchange performance in the cooler and extend the cycle of inspection and maintenance in the cooler. The purpose is to provide a device.

[0007]

A gas dehydrator according to the present invention comprises a cooler for cooling an atmospheric gas used in a heat treatment furnace, and a pipe arranged in the cooler and through which water flows. Which has a heat exchange coil, a flow path pipe connected to the heat exchange coil and through which the water circulates, and a cooling means for cooling the water in the middle of the flow path tube, and is fed into the cooler. It is characterized in that the atmospheric gas is cooled to be dehydrated and then sent out from the cooler. Further, it is preferable that the cooling means cools the water in the flow passage pipe by bringing a cooling flon close to the flow passage pipe.

[0008]

In the present invention, the atmospheric gas is dehydrated by cooling the atmospheric gas with a cooler and allowing the moisture in the atmospheric gas to adhere to the surface of the heat exchange coil. At this time, in the heat exchange coil provided in the cooler, the atmosphere gas is cooled by flowing water as a refrigerant,
Even when dust or the like in the atmosphere gas adheres to the surface of the heat exchange coil to lower the heat exchange property, it is possible to prevent the heat exchange property from decreasing by lowering the temperature of the water. it can. Therefore, the device of the present invention can operate for a long period of time even if the heat exchange coil is dirty, and can remove the moisture in the atmospheric gas.

Further, as a means for cooling the water circulating in the heat exchange coil, the temperature of the water can be easily lowered by bringing the cooling freon close to the flow passage pipe through which the water flows. The cooling freon is a freon in a vaporized state in which heat of evaporation is taken from the surroundings.

[0010]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a gas dehydrator according to an embodiment of the present invention. As shown in FIG. 1, the gas dehydrator is provided with a cooler 1, and in the cooler 1, a heat exchange coil 9 made of a metal tube or the like and through which water serving as a refrigerant flows is provided. Further, the cooler 1 is provided with a blowing port 2 for feeding the atmospheric gas, and is also provided with a blowing port 3 for feeding the cooled atmospheric gas.

Both pipe ends 9a and 9b of the heat exchange coil 9 are connected to a flow passage pipe 8 through which water circulates outside the cooler 1. A brine tank 4 for storing water and open / close valves 7a and 7b are provided in the middle of the flow path pipe 8.
A pump 5 for circulating water is provided between a and the on-off valve 7b. Further, the water in the flow path pipe 8 is made into a refrigerant (CFC).
A heat exchanger 6 for cooling is provided.

The cooling device for cooling the water in the flow path pipe 8 by the heat exchanger 6 is constructed as follows. That is, the chlorofluorocarbon channel 18 is configured so that chlorofluorocarbon circulates therein, and the compressor 11 and the condenser 12 are provided in the fluorocarbon channel 18. Further, an electromagnetic valve 14 and an expansion valve 15 are provided between the condenser 12 and the heat exchanger 6.

In the gas dehydrator constructed as described above, the atmospheric gas is cooled in the following manner for dehydration. First, the water in the flow path pipe 8 is cooled in the heat exchanger 6, and this cold water is sent through the flow path pipe 8 to the heat exchange coil 9 in the cooler 1. At this time, the atmospheric gas sent from the blow-in port 2 of the cooler 1 is cooled by coming into contact with the surface of the heat exchange coil 9, and the moisture in the atmospheric gas adheres to the surface of the heat exchange coil 9. As a result, the atmospheric gas can be dehydrated, and the dehydrated atmospheric gas is sealed in the heat treatment furnace from the blowout port 3 of the cooler 1 via a flow hose (not shown) or the like.

By dehydrating the atmospheric gas in this manner, the atmospheric gas having a dew point of 40 ° C. can be lowered to 12 ° C. or lower.

After that, the water whose temperature has risen in the cooler 1 due to heat exchange with the atmospheric gas is temporarily stored in the brine tank 4. Then, the on-off valves 7a and 7b provided in the flow path pipe 8 are opened, and the pump 5 is driven, whereby the water flowing out from the brine tank 4 is sent to the heat exchanger 6 through the flow path pipe 8. And cooled again.

Further, in the heat exchanger 6, the water in the flow path pipe 8 is cooled as follows. First, the freon in the freon flow path pipe 18 is brought into a high-temperature, high-pressure heated gas state by the compressor 11. This gaseous chlorofluorocarbon is sent to the condenser 12, and the cooling water 13 takes away heat to liquefy it. Then, the electromagnetic valve 14 is opened, and the liquefied chlorofluorocarbon passes through the expansion valve 15 to be depressurized and rapidly vaporized, and the vaporized chlorofluorocarbon is sent to the heat exchanger 6. The vaporized CFCs in the heat exchanger 6 cool the inside of the heat exchanger 6 by removing the heat of evaporation from the surroundings. As a result, the water in the flow path pipe 8 that passes through the heat exchanger 6 is cooled, and this cold water is sent to the heat exchange coil 9 in the cooler 1.

The ambient gas is cooled in the cooler 1 by circulating the cold water in the flow passage pipe 8 in this way, but the ambient gas sent from the blow-in port 2 into the cooler 1 is not Since dust such as dust is also included, the surface of the heat exchange coil 9 becomes dirty due to the attachment of dust. For this reason,
Although the heat exchange performance of the heat exchange coil 9 is reduced,
Since water is used as the refrigerant in the heat exchange coil 9,
Unlike CFCs that have been used as a refrigerant in the past, even if the heat exchange performance is deteriorated, the operation of the gas dehydrator itself does not stop due to the pressure decrease of the refrigerant. Further, even if the heat exchanging property is deteriorated, it is possible to prevent the heat exchanging property from being deteriorated by further lowering the temperature of the water flowing through the flow path pipe 8 in the heat exchanger 6. Therefore, compared with the conventional case where CFC is used as the refrigerant,
The operation of the gas dehydrator can be continued and the cooler 1
The internal inspection and maintenance cycle can be extended twice as long as before.

[0018]

As described above, according to the present invention,
Water as a refrigerant is passed through the heat exchange coil arranged in the cooler to cool the atmospheric gas, so that the surface of the heat exchange coil becomes dirty due to adhesion of dust and the like in the atmospheric gas and heat exchange. Even if the property is lowered, the heat exchange property can be prevented from being lowered by lowering the temperature of the water. For this reason, the device of the present invention can be operated for a long period of time, and the period of inspection and maintenance in the cooler can be doubled as compared with the conventional case.

As a cooling means for the water, a cooling freon is brought close to a flow passage pipe through which the water flows,
The temperature of the water can be easily lowered.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a gas dehydrator according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a conventional gas dehydrator.

[Explanation of symbols]

 1, 21; Cooler 2, 22; Blow-in port 3, 23; Blow-out port 4; Brine tank 5; Pump 6; Heat exchanger 7a, 7b; Open / close valve 8, 18, 28; Flow pipe 9; Heat exchange coil 9a, 9b; tube ends of heat exchange coil 11, 26; compressor 12, 27; condenser 13; cooling water 14; solenoid valve 15, 25; expansion valve 29; heat exchange section 29a, 29b; tube of heat exchange section end

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kuriyama 1-2-8 Marunouchi, Chiyoda-ku, Tokyo Incorporated company Kobe Steel, Ltd. Tokyo head office

Claims (2)

[Claims] 1. A cooler for cooling an atmospheric gas used in a heat treatment furnace, a heat exchange coil including a pipe arranged in the cooler and having water flowing therein, and connected to the heat exchange coil. The cooling water has a flow passage pipe and a cooling means for cooling the water in the middle of the flow passage pipe, and the atmosphere gas sent into the cooler is cooled to dehydrate and cool the atmosphere gas. A gas dehydrator characterized by being sent out from a container. 2. The gas dehydrator according to claim 1, wherein the cooling unit cools water in the flow passage pipe by bringing a cooling flon close to the flow passage pipe.